NaI-Catalyzed Oxidative Amination of Aromatic Sodium Sulfinates: Synergetic Effect of Ethylene Dibromide and Air as Oxidants
作者:Ying Fu、Quan-Zhou Li、Qin-Shan Xu、Helmut Hügel、Ming-Peng Li、Zhengyin Du
DOI:10.1002/ejoc.201801386
日期:2018.12.31
A novel NaI-catalyzed oxidative amination of sodium sulfinates, employing both ethylenedibromide (EDB) and air as the oxidants, is described. EDB was first demonstrated to be a promising mild organic oxidant that in air, converted NaI into molecular iodine to promote the cross-coupling reactions of aromatic sodium sulfinates with amines to produce arylsulfonamides. Mechanistic studies indicated that
描述了一种使用二溴化乙烯 (EDB) 和空气作为氧化剂的新型 NaI 催化亚磺酸钠氧化胺化。EDB 首次被证明是一种有前途的温和有机氧化剂,它在空气中将 NaI 转化为分子碘,以促进芳族亚磺酸钠与胺的交叉偶联反应,生成芳基磺酰胺。机理研究表明,反应过程中可能涉及自由基途径。
Transition-Metal-Free Dehydrogenative N-N Coupling of Secondary Amines with KI/KIO<sub>4</sub>
作者:Dehang Yin、Jian Jin
DOI:10.1002/ejoc.201900763
日期:2019.9.8
brother do it together: With KI/KIO4, a transition‐metal‐free dehydrogenativeN–Ncoupling of secondaryamines has been accomplished. A diverse range of diphenylamines, carbazoles, and N‐alkylanilines readily undergo N–N homo‐coupling effectively. Notably, the N–N cross‐coupling of two different arylamines is also demonstrated, providing a straightforward approach to complex N–N structures.
碘兄弟一起做:借助KI / KIO 4,已实现了仲胺的无过渡金属脱氢N-N偶联。各种各样的二苯胺,咔唑和N-烷基苯胺很容易有效地进行N-N均偶联。值得注意的是,还展示了两种不同芳基胺的N–N交叉偶联,为复杂的N–N结构提供了直接的方法。
Intermediates in the reaction of N,N-dimethylanilines with palladium (II) acetate were trapped by acetate ion or oxygen to give N-methyloxygenated and demethylated products, while the trapping by other anilines gave homo- and cross-coupling cyclodimers. The reactions proceed via radical cation formation induced by the palladium salt.
A Dehydrogenative Homocoupling Reaction for the Direct Synthesis of Hydrazines from N-Alkylanilines in Air
作者:Zhi-Zhen Huang、Xue-Ming Yan、Zhi-Ming Chen、Fei Yang
DOI:10.1055/s-0030-1259520
日期:2011.3
A copper-catalyzed N-N bond-forming reaction was performed by a dehydrogenative homocoupling of N-alkylanilines, affording N,N′-dialkyl-N,N′-diphenylhydrazines in 72-88% yields. This new strategy has the advantages of direct synthesis from N-alkylanilines, using air as the oxidant, convenient manipulations, mild reaction conditions and moderate to good yields. A possible mechanism by coordination and reductive elimination has been proposed.
Fast Synthesis of Hydrazine and Azo Derivatives by Oxidation of Rare-Earth-Metal−Nitrogen Bonds
作者:Lijun Zhang、Jing Xia、Qinghai Li、Xihong Li、Shaowu Wang
DOI:10.1021/om1009928
日期:2011.2.14
A novel N−N coupling reaction was developed through the oxidation of rare-earth-metal−nitrogen bonds produced by treatment of the easily available rare-earth-metal amides [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 with aromatic primary or secondary amines. The reaction provides the symmetrical or unsymmetrical azo compounds and hydrazinederivatives in good to high yields within a very short time under mild conditions